/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you under the Apache License, Version 2.0 (the

  * "License"); you may not use this file except in compliance

  * with the License.  You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.apache.giraph.comm.requests;

 import org.apache.giraph.comm.netty.SaslNettyServer;

 import org.apache.log4j.Logger;

 import java.io.DataInput;

 import java.io.DataOutput;

 import java.io.IOException;

 /**

  * Send and receive SASL tokens.

  */

 public class SaslTokenMessageRequest extends WritableRequest {

   /** Class logger */

   private static final Logger LOG =

       Logger.getLogger(SaslTokenMessageRequest.class);

   /** Used for client or server's token to send or receive from each other. */

   private byte[] token;

   /**

    * Constructor used for reflection only.

    */

   public SaslTokenMessageRequest() { }

  /**

    * Constructor used to send request.

    *

    * @param token the SASL token, generated by a SaslClient or SaslServer.

    */

   public SaslTokenMessageRequest(byte[] token) {

     this.token = token;

   }

   /**

    * Read accessor for SASL token

    *

    * @return saslToken SASL token

    */

   public byte[] getSaslToken() {

     return token;

   }

   /**

    * Write accessor for SASL token

    *

    * @param token SASL token

    */

   public void setSaslToken(byte[] token) {

     this.token = token;

   }

   @Override

   public RequestType getType() {

     return RequestType.SASL_TOKEN_MESSAGE_REQUEST;

   }

   @Override

   public void readFieldsRequest(DataInput input) throws IOException {

     int tokenSize = input.readInt();

     token = new byte[tokenSize];

     input.readFully(token);

   }

   /**

    * Update server's token in response to the SASL token received from

    * client. Updated token is sent to client by

    * SaslServerHandler.messageReceived().

    *

    * @param saslNettyServer used to create response.

    */

   public void processToken(SaslNettyServer saslNettyServer) {

     if (LOG.isDebugEnabled()) {

       LOG.debug("processToken:  With nettyServer: " + saslNettyServer +

           " and token length: " + token.length);

     }

     token = saslNettyServer.response(token);

     if (LOG.isDebugEnabled()) {

       LOG.debug("processToken: Response token's length is:" + token.length);

     }

   }

   @Override

   public void writeRequest(DataOutput output) throws IOException {

     output.writeInt(token.length);

     output.write(token);

   }

   @Override

   public int getSerializedSize() {

     return super.getSerializedSize() + 4 + token.length;

   }

 }